Network camera

ABSTRACT

A network camera includes: a camera main unit including an image sensor unit and a movable portion having a motor for swiveling the image sensor unit; and a base unit, connected detachably to the camera main unit and fixed to a camera installation surface, the base unit having a nonvolatile memory for storing network operation information including network setting information unique to the network camera.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a network camera for transmitting aphotographed image to a client terminal via a network.

2. Description of Related Art

It has been known that there is a technology for viewing an image sentfrom a network camera installed in a remote place via a network such asthe Internet, or a network camera installed within a LAN (Local AreaNetwork), on a screen of a terminal such as a personal computer or amobile telephone.

A network camera that has a swivel base for swiveling an image sensorunit and is capable of such operations as pan and tilt by a remoteoperation has been widely available as a common produce in the market.Such a network camera having a swivel base offers great convenience tothe user since, for example, it can control the angle of view for takingan image via a net work by swiveling the image sensor unit. It should benoted that such a camera having a swivel base is applied not only to thenetwork camera but also to television systems such as the NTSC (NationalTelevision Standards Committee) television system.

In the camera having a swivel base, the swivel base driving unit isusually made up of many components, such as a motor and a speedreduction mechanism (such as gears and belts). These componentsgenerally tend to deteriorate more easily than electronic components,and they have predetermined service life. Therefore, periodicmaintenance is necessary to use these components sustainably.

With a camera having many wiring cables, all the wiring cables need tobe disconnected when removing the camera main unit from the mount basefor maintenance, and the workload of the maintenance is considerable. Inaddition, the network camera having a swivel base is often used forsurveillance, so in many cases, the system is not permitted to stop fora long time during maintenance. In particular, in the case where a largenumber of cameras are used at one location, the wiring cables of all thecameras need to be disconnected during maintenance, and whenreinstalling the cameras back to the original locations, wiring needs tobe done again. This requires a very large number of work hours.

In view of this, a camera furnished with a one-touch installationmechanism for attaching/detaching a camera main unit and a mount basewith a single touch of a button, without cables, has become commonplacein recent years. Network cameras furnished with a one-touch installationmechanism have been widely used, for example, for surveillance.

In the camera furnished with the one-touch installation mechanism, aterminal or the like for connecting to an external device is provided atits mount metal fitting that serves as a base unit, for example, andfurther wiring cables are connected thereto. Then, the camera is fittedto a wall surface, a ceiling, or the like. The camera main unit isconfigured so as to be fitted to the mount metal fitting. The cameramain unit and the base unit are connected by a connector. In addition,the camera has a mechanical retaining mechanism such as a lock button.The camera furnished with the one-touch installation mechanism with sucha configuration can be installed and removed easily. (See, for example,JP-A-2005-26866.)

SUMMARY OF THE INVENTION

Such a camera furnished with the one-touch installation mechanism offersconvenience to the worker who performs the installation and removal ofthe camera. However, such a network camera furnished with the one-touchinstallation mechanism has the following problem, for example.

Normally, each of the devices has an unique IP (Internet Protocol)address in a LAN that utilizes TCP/IP (Transmission ControlProtocol/Internet Protocol). For example, in the case where IP addresses“192.168.100”, “192.168.101”, “192.168.102”, “192.168.103”, and“192.168.104” are assigned to network devices 31 to 35 connected to anetwork 30, respectively, as shown in FIG. 6, data can be transmitted tothe network device 34 by specifying the IP address “192.168.103” in thenetwork 30. Likewise, the network cameras, which are one type of networkdevice, cannot be used if the IP address is not set precisely.

However, the IP address that is set for the network camera is stored ina memory furnished in the camera main unit, and therefore, setting ofthe IP address needs to be carried out again when a replacement networkcamera is installed during maintenance of a network camera, for example.Usually, it is difficult for one who does not have networkadministration knowledge to understand IP addresses. In addition, ittakes a lot of effort even for one who possesses such knowledge to setthe IP address every time the network camera is replaced. For thisreason, the maintenance work efficiency has been low although thenetwork camera has the one-touch replacement mechanism.

Thus, it is desirable to increase the efficiency of setting work of anetwork camera.

According to an embodiment of the invention, there is provided a networkcamera including a camera main unit including an image sensor unit and amovable portion having a motor for swiveling the image sensor unit, anda base unit, connected detachably to the camera main unit and fixed to acamera installation surface, the base unit having a nonvolatile memoryfor storing network operation information including network settinginformation unique to the network camera.

The network camera according to the embodiment of the invention makes itpossible to inherit the network operation information to a replacementcamera main unit by storing process information including the networksetting information, such as IP addresses, in the memory provided in thebase unit, even when the camera main unit is replaced with thereplacement camera main unit. Such a network camera according to theembodiment of the invention makes it possible to increase the workefficiency when replacing the camera main unit with a replacement cameramain unit, such as during maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating the configuration of networkcameras according to an embodiment of the invention.

FIGS. 2A to 2D are views illustrating an example of the configurationand an installation operation of a network camera according to anembodiment of the invention.

FIGS. 3A to 3D are views illustrating an example of the configurationand an installation operation of a network camera according to anembodiment of the invention.

FIG. 4 is a diagram illustrating the internal structure of a networkcamera according to an embodiment of the invention.

FIG. 5 is a diagram illustrating the configuration of a network camerain related art.

FIG. 6 is a schematic view illustrating a plurality of client terminalsconnected to a network.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinbelow, specific embodiments of the invention will be described indetail with reference to the drawings.

As illustrated in FIG. 1, a network camera 1 (network cameras 1 a, 1 b,1 c, . . . ) according to this embodiment is connected to a clientterminal 3 (client terminals 3 a, 3 b, 3 c, . . . ) via a network 2,such as a LAN utilizing TCP/IP.

FIGS. 2A to 2D are views illustrating an example of the configurationand an installation operation of a network camera 1 according to anembodiment of the invention.

The network camera 1 is furnished with a swivel base (not shown) forswiveling a lens provided in a camera block by a motor. Therefore, thenetwork camera 1 is made up of many components, such as a motor and aspeed reduction mechanism (such as gears and belts). These componentsgenerally tend to deteriorate more easily than electronic components,and they have predetermined service life. Therefore, periodicmaintenance is necessary. For this reason, the network camera 1 isfurnished with a one-touch installation mechanism that allows it to beinstalled on a camera installation surface such as a ceiling or a wallsurface with a single touch of a button, so that it can be attachedto/detached from the camera installation surface with a simple operationduring maintenance.

The network camera 1 shown in FIGS. 2A to 2D is furnished with a mountmetal fitting 11, serving as a base unit, and a camera main unit 12.When the network camera 1 is installed on the camera installation face14, such as a ceiling and a wall surface, the mount metal fitting 11 isfixed to the camera installation face 14 first, as shown in FIG. 2A,with the use of screws (not shown). Then, the marks (not shown) providedrespectively on the mount metal fitting 11 and the camera main unit 12are matched. Next, as shown in FIG. 2B, a wire (not shown) forpreventing the camera from falling is fastened to the mount metalfitting 11, and thereafter, the camera main unit 12 is fitted to themount metal fitting 11. This causes a fastening lock button 13 on a sideface of the camera main unit 12 to protrude from the side face.Subsequently, as shown in FIG. 2C, the camera main unit 12 is fitted tothe mount metal fitting 11 by pressing the knob of the fastening lockbutton 13. The network camera 1 is secured and installed to the camerainstallation face 14, as shown in FIG. 2D. The network camera 1 that hasbeen installed by such a simple operation can be detached/attached evenduring maintenance by the simple operation of releasing the fasteninglock button 13 and removing only the camera main unit 12, while themount metal fitting 11 is kept as it is.

It should be noted that, as shown in FIGS. 3A to 3D, the network camera1 may further be furnished with an embedding metal fitting 15 inaddition to the mount metal fitting 11 and the camera main unit 12 sothat it may be installed on a camera installation face 14 a. When such anetwork camera 1 furnished with the embedding metal fitting 15 isinstalled onto the camera installation face 14, the embedding metalfitting 15 is embedded into the camera installation face 14 a first, asshown in FIG. 3A. Next, as shown in FIG. 3B, the mount metal fitting 11is fixed to the embedding metal fitting 15 with screws. Then, the marksprovided respectively on the mount metal fitting 11 and the camera mainunit 12 are matched. Next, as shown in FIG. 3C, the camera main unit 12is fixed to the mount metal fitting 11, and an embedding ring (notshown) is fitted thereto. The network camera 1 is secured to the camerainstallation face 14 a, as shown in FIG. 3D. The network camera 1 thathas been installed by such a simple operation can be detached/attachedeven during maintenance by the simple operation of releasing a fasteninglock (not shown) and removing only the camera main unit 12, while themount metal fitting 11 is kept as it is.

FIG. 4 is a diagram illustrating the internal structure of the networkcamera 1. In the network camera 1, the mount metal fitting 11 and thecamera main unit 12 are connected detachably to each other via theconnector 101 and the connector 126.

The mount metal fitting 11 is a base unit for fitting the camera mainunit 12 to the camera installation face 14, such as a ceiling or a wallsurface. The mount metal fitting 11 is provided with a connector 101, aLAN terminal 102, a signal input/output terminal 103, a power supplyterminal base 104, and an EEPROM (Electrically Erasable and ProgrammableRead Only Memory) 105, which is a nonvolatile memory. The connector 101has connecting cables. By the connect cables, the connector 101 isconnected to the LAN terminal 102, the signal input/output terminal 103,and the power supply terminal base 104.

The camera main unit 12 includes a movable portion 110 for moving animaging direction and a stationary portion 120 for performing imagesignal processing for image signal and data transmission/reception via anetwork.

The movable portion 110 includes a camera block 111 as an image sensorunit, a pan motor 112, a tilt motor 113, a motor driving circuit 114,and a motor controlling microcomputer 115.

The stationary portion 120 includes an image signal processing unit 121,a network image processing controlling microcomputer 122, a signalprocessing unit 123, a flash memory 124, a DC/DC converter 125, and aconnector 126.

The camera block 111 as the image sensor unit, provided in the movableportion 110, includes an interline type CCD (Charge Coupled Devices)image sensor (not shown) and a timing generator (not shown) foroperating the interline type CCD image sensor.

In the camera block 111, the interline type CCD image sensor causes thelight from a photographic subject to form an image on a light-receivingplane of an image sensor element by an optical system (not shown) suchas a lens so as to carry out photoelectric conversion at a field cycle,and it outputs an interlace output, i.e., to output an image output ofan odd-numbered field and an image output of an even-numbered field,which constitute one frame, alternately. The interline type CCD imagesensor outputs analog image signals sequentially as the image outputs ofthe respective fields. Here, the camera block 111 sets a motiondetection mode for the photographic subject by later-described motiondetection setting information and performs the above-described imagingprocess.

The image signal processing unit 121 provided in the stationary portion120 samples and holds the analog image signal from the interline typeCCD image sensor and performs A/D (Analog to Digital) conversion. Theimage signal processing unit 121 performs a compression process for theobtained digital image signal thus obtained by a codec or the like, togenerate compressed image data compliant to, for example, the JPEG(Joint Photographic Experts Group) standard format. The image signalprocessing unit 121 performs such image processing using later-describedvarious types of image output function information.

The flash memory 124 stores a control program for controlling a seriesof signal processing operations in the network camera 1. The networkimage processing controlling microcomputer 122 reads out the controlprogram stored in the flash memory 124 and executes a series of signalprocessing operations including the following signal processing.

The network image processing controlling microcomputer 122 supplies thecompressed image data generated by the image signal processing unit 121to the signal processing unit 123 according to a protocol such as TCP/IP(Transmission Control Protocol/Internet Protocol). In addition, thenetwork image processing controlling microcomputer 122 causes the flashmemory 124 to store the compressed image data.

The signal processing unit 123 performs signal processing to the signalsupplied from the network image processing controlling microcomputer 122so as to transmit the signal to Ethernet (registered trademark)standardized by IEEE (The Institute of Electrical and ElectronicsEngineers, Inc.) 802.3u. Thereafter, the processed signal is transmittedto the network 2 via the connectors 126, 101, and the LAN terminal 102.

In addition, the signal processing unit 123 supplies data of thelater-described network camera information and various types ofcommands, which are received from the network 2 via the LAN terminal 102and the connectors 101 and 126, to the network image processingcontrolling microcomputer 122.

The network image processing controlling microcomputer 122 supplies thenetwork camera information supplied from the signal processing unit 123to the EEPROM 105 via the connectors 126 and 101. The network camerainformation includes network operation information necessary for thenetwork camera 1 on the network 2, motion detection setting informationused in an image taking process, and swivel base setting information forswiveling the camera block 111. An example of the network operationinformation may be network setting information including, for example,an IP address unique to the network camera 1.

Also, the network image processing controlling microcomputer 122supplies a command supplied from the signal processing unit 123 to ablock that is the subject of the command. For example, when receiving amovable portion operating command for moving the movable portion 110from the client terminal 3 via the network 2, the network imageprocessing controlling microcomputer 122 transmits the movable portionoperating command to the motor controlling microcomputer 115 and itinstructs the motor controlling microcomputer 115 to control the drivingof the pan motor 112 and the tilt motor 113 by the motor driving circuit114.

The motor controlling microcomputer 115 supplies data according to themovable portion operating command supplied from the network imageprocessing controlling microcomputer 122 to the motor driving circuit114, to control the motor drive operations of the motor driving circuit114.

The motor driving circuit 114 supplies a drive current to the pan motor112 and the tilt motor 113 to drive the pan motor 112 and the tilt motor113. It should be noted that when step motors are used for the pan motor112 and the tilt motor 113, drive pulses corresponding to the rotationspeed of the motors are applied to the pan motor 112 and the tilt motor113. The rotation shafts of the pan motor 112 and the tilt motor 113 arefixed to the swivel base, and the swivel base causes the camera block111, an image sensor unit having a lens, to rotate by a predeterminedangle in a pan direction or a tilt direction.

A power supply cable from a power source installed in the camerainstallation face 14 is connected to the power supply terminal base 104.The power supply terminal base 104 supplies a power output of DC 12 V orAC 24 V to the DC/DC converter.

The DC/DC converter 125 adjusts a voltage of power output of DC 12 V orAC 24 V supplied from the power supply terminal base 104 to a lowvoltage power output of DC 12 V, or the like. The DC/DC converter 125supplies the low voltage power output to the image signal processingunit 121, the motor controlling microcomputer 115, and the camera block111.

Various types of network camera information are stored in the EEPROM105. An example of the network camera information is an IP addressunique to the network camera 1. This IP address is set by a clientterminal that administers the network camera 1.

Even when the camera main unit 12 is replaced, the network camera 1 caninherit the network camera information to the replaced network camera bystoring the network camera information in the EEPROM 105 provided in themount metal fitting 11.

Examples of the network camera information include network operationinformation, motion detection setting information, and swivel basesetting information, such as the following.

(1) Network Operation Information (Web Server Function)

(1-1) Image Output Function Information in the Image Signal ProcessingUnit 121

-   -   Codec operation selection    -   Image size (VGA, QVGA, or QQVGA)    -   Digital zoom function (for example, 12×)    -   Compression ratio (for example, each codec: 5 steps)        (1-2) Alarm Setting Information    -   Process to be performed at the time of alarm (mail service, FTP        (File Transfer Protocol) service, image recording, etc.)    -   Alarm output (Specifying ON/OFF etc.)    -   Time alarm        (1-3) User Setting Information    -   Administrator ID, password    -   User ID, password, access level        (1-4) Network Setting Information    -   Enable/disable DHCP (Dynamic Host Configuration Protocol)        setting    -   IP address    -   Netmask setting    -   Gateway setting    -   DNS (Domain Name System) server setting        (1-5) SMTP Setting Information    -   SMTP (Simple Mail Transfer Protocol) server specified    -   Destination address    -   Subject    -   Text content    -   Attached image specified        (1-6) Ftp Client Setting Information    -   FTP server (Host name, user ID, password)    -   Transfer interval    -   Setting of operation event (timer, alarm, motion detection)    -   System upgrade setting    -   FTP server for storing the upgraded program    -   Security setting    -   IP filtering setting    -   FTP server setting    -   User account setting, access privilege setting        (2) Motion Detection Setting Information in the Camera Block 111    -   Setting of photographic subject detection mode (for example,        moving subject/non-moving subject)    -   Setting of detection frame    -   Setting of masking frame    -   Setting of the size of the detection subject    -   Setting of detection sensitivity        (3) Swivel Base Setting Information    -   Operation mode setting    -   Operation speed setting in each mode    -   Setting of present functions, etc. (e.g., the direction of the        swivel base, camera zoom lens position)

In this way, the network camera 1 is configured so that the camera mainunit 12 can be easily attached to and detach from the mount metalfitting 11, serving as the base unit, via the connectors 126 and 101. Inaddition, even when the camera main unit 12 is replaced with areplacement camera main unit, the network camera 1 can inherit thenetwork camera information, such as IP addresses, to the replaced cameramain unit because the network camera information is stored in the EEPROM105 provided in the mount metal fitting 11. Such a network camera makesit possible to increase the work efficiency when replacing the cameramain unit with a replacement camera main unit, such as duringmaintenance of the network camera 1.

On the other hand, a related art network camera has the structure asshown in FIG. 5, for example. Here, the same component parts as those ofthe network camera 1 of this embodiment are designated by the samereference numerals, and the explanations thereof will be omitted. Arelated art network camera 200 stores network camera information such asIP addresses in a flash memory 124 provided in a camera main unit 12. Insuch a related art network camera, the camera main unit 12 possesses thenetwork camera information, so the network camera information needs toset again when the camera main unit 12 is replaced with another cameramain unit, for example, during maintenance. The network camera 1 canresolve all such problems in the related art network camera and canincrease the efficiency in the maintenance work.

It may appear possible to design the network camera according to thisembodiment so that the electronic circuits such as the image processingmicrocomputer to be incorporated in the mount metal fitting, which isthe base unit. In this case, the network camera requires maintenanceonly for the failures of the mechanical structures, so it may seem tooffer a great degree of convenience. However, when performingmaintenance for the failures in the electronic circuit, the mount metalfitting serving as the base unit needs to be replaced. Therefore, it isinappropriate to configure the network camera to have a one-touchinstallation mechanism by a connector joint.

In contrast, the network camera 1 according to this embodiment enclosesall the electronic circuits and mechanical structures in the camera mainunit 12, and encloses the EEPROM 105, which is a nonvolatile memory, inthe mount metal fitting 11. Thereby, the network camera 1 is allowed tohave one-touch replacement mechanism so that the camera main unit 12 canbe removed with a simple operation. As a result, the work efficiency ofthe maintenance for the failures in the electronic circuits can beincreased. Actually, the failure rate of a nonvolatile memory such asthe EEPROM 105 per one unit is very low. For this reason, it isunnecessary for the network camera 1 to remove the mount metal fitting11 and perform maintenance for the EEPROM 105, so maintenance can beperformed efficiently with a simple operation.

It should be noted that the invention is not limited to the foregoingembodiments, but various modifications are of course possible withoutdeparting from the scope of the invention.

The present application contains subject matter related to thatdisclosed in Japanese Priority Patent Application JP filed in the JapanPatent Office on Jul. 9, 2008, the entire contents of which is herebyincorporated by reference.

It should be understood by those skilled in the art that variousmodifications, combinations, sub-combinations and alterations may occurdepending on design requirements and other factors insofar as they arewithin the scope of the appended claims or the equivalents thereof.

What is claimed is:
 1. A network camera usable for a camera systemincluding plural cameras, comprising: a camera main unit including (a) amovable portion having an image sensor unit, a motor, a motor drivingcircuit, and a motor controlling unit for swiveling the image sensorunit, and (b) a stationary portion having an image signal processingunit, a network image processing controlling unit, and a signalprocessing unit, the camera main unit being replaceable, and (c) a lockbutton; and a base unit that fixes the network camera to an installationface, the base unit having a nonvolatile memory for storing networkoperation information including network setting information foroperating the network camera or replacement camera main unit received bythe base unit, the base unit being detachably connected to the cameramain unit via the lock button, the base unit including motion detectionsetting information for setting a motion detection mode for the imagesensor unit for a subject imaged by the image sensor unit, the motiondetection setting information including at least one of setting amasking frame and setting a size of a detection subject, wherein thebase unit has no image sensor unit, no motor driving circuit, and noimage signal processing unit, wherein when the camera main unit isconnected with the base unit, the lock button protrudes from a side faceof the camera main unit and is accessible by a human hand, wherein themotion detection setting information is used in both the camera mainunit and a replacement camera main unit, and wherein the replacementcamera main unit is used in the network camera as a replacement of thecamera main unit.
 2. The network camera as set forth in claim 1, whereinthe motor includes a pan motor for swiveling the image sensor unit in apan direction and a tilt motor for swiveling the image sensor unit in atilt direction.
 3. The network camera as set forth in claim 1, whereinthe network setting information includes an IP (Internet Protocol)address.
 4. The network camera as set forth in claim 1, wherein: theimage signal processing unit for performs predetermined image processingfor an image signal generated by the image sensor unit to generatecompressed image data; and the nonvolatile memory stores, as the networkoperation information, image output function information used for theimage processing performed by the image signal processing unit.
 5. Thenetwork camera as set forth in claim 1, wherein the base unit furtherincludes an embedded fitting configured to be embedded into theinstallation face.
 6. A network camera usable for a camera systemincluding plural cameras, comprising: a camera main unit including (a) amovable portion having an image sensor unit, a motor, a motor drivingcircuit, and a motor controlling unit for swiveling the image sensorunit, and (b) a stationary portion having an image signal processingunit, a network image processing controlling unit, and a signalprocessing unit, the camera main unit being replaceable, and (c) a lockbutton; and a base unit that fixes the camera main unit to aninstallation face, the base unit having a nonvolatile memory for storingnetwork operation information including network setting information foroperating the network camera or replacement camera main unit received bythe base unit, the base unit being detachably connected to the cameramain unit via the lock button, the base unit including motion detectionsetting information for setting a motion detection mode for the imagesensor unit for a subject imaged by the image sensor unit, the motiondetection setting information including at least one of setting amasking frame and setting a size of a detection subject, wherein thebase unit has no image sensor unit, no motor driving circuit, and noimage signal processing unit, wherein when the camera main unit isconnected with the base unit, the lock button protrudes from a side faceof the camera main unit and is accessible by a human hand, wherein themotion detection setting information is used in both the camera mainunit and a replacement camera main unit, and wherein the replacementcamera main unit is used in the network camera as a replacement of thecamera main unit.
 7. A method for setting a motion detection mode for aphotographic subject in an image sensor unit of a camera main unit of anetwork camera usable for a camera system including plural cameras,comprising the steps of: providing a base unit that fixes the networkcamera to an installation face, wherein the base unit has no imagesensor unit, no motor driving circuit, and no image signal processingunit; providing a lock button to the camera main unit the camera mainunit being detachably connected to the base unit via the lock button,wherein the cameral main unit is replaceable, wherein when the cameramain unit is connected with the base unit, the lock button protrudesfrom a side face of the camera main unit and is accessible by a humanhand; storing network operation information of the network camera in anonvolatile memory of the base unit, wherein the network operationinformation includes network setting information for operating thenetwork camera or replacement camera main unit received by the baseunit, and motion detection setting information for setting a motiondetection mode for the image sensor unit for a subject imaged by theimage sensor unit, the motion detection setting information including atleast one of setting a masking frame and setting a size of a detectionsubject, in a nonvolatile memory in the base unit, wherein the motiondetection setting information is used in both the camera main unit and areplacement camera main unit, and wherein the replacement camera mainunit is used in the network camera as a replacement of the camera mainunit.